I would have to see the wording or the pictures.
It should be noted that on a two piece driveshaft that has three "U"(universal) joints the 1st U joint and the 2nd U are in phase. At the same time the 2nd U joint and the 3rd U joint are also in phase. The 1st U joint and the 3rd U joint are therefore, 90 degrees out of phase.
If any one of those three U joints is a constant velocity joint, that changes everything.
